420021822 has 32 divisors (see below), whose sum is σ = 970320384. Its totient is φ = 119792000.

The previous prime is 420021803. The next prime is 420021827. The reversal of 420021822 is 228120024.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420021827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186054 + ... + 188297.

It is an arithmetic number, because the mean of its divisors is an integer number (30322512).

Almost surely, 2^420021822 is an apocalyptic number.

420021822 is an abundant number, since it is smaller than the sum of its proper divisors (550298562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420021822 is a wasteful number, since it uses less digits than its factorization.

420021822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374384.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 420021822 is about 20494.4339272886. The cubic root of 420021822 is about 748.9002085110.

Adding to 420021822 its reverse (228120024), we get a palindrome (648141846).

The spelling of 420021822 in words is "four hundred twenty million, twenty-one thousand, eight hundred twenty-two".